Results 31 to 40 of about 469,716 (286)
Microphotograph of the end face of the oxidized coal sample and crack extraction.
, 2022 Microphotograph of the end face of the oxidized coal sample and crack extraction.
Ke Gao (1521607) +5 more
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Characterization of humic acids from original coal and its oxidization production
Scientific Reports, 2021 Five coal samples obtained from Chinese coal-producing areas were oxidized by hydrogen peroxide (H2O2), and humic acids (HAs) were derived from original coal and its oxidizition samples.
Shuangdui Yan +6 more
doaj +1 more source
矿业科学学报, 2021 In order to master the fire-extinguishing efficiency of different concentrations of CO2 on the oxidized coal re-combustion, a self-developed coal spontaneous oxidation program temperature increasing experimental device was adopted to study the inhibitory
Guo Zhiguo +4 more
doaj +1 more source
Studies on the Oxidative Degradation of Coal.(II)
Journal of the Fuel Society of Japan, 1958 従来不確定なものとされているフミソ酸の分子量について再検討するために, まず有機溶媒の氷点降下法について得られる分子量値の意味について考察した。カルボキシル基, 水酸基を持っ芳香族系化合物およびそれらの誘導体をモデル物質とし, これらの化合物による有機溶媒 (P-フェノール, アセトアマイドなど) の氷点降下現象を観察し, ついでフミソ酸およびその誘導体ならびに石炭の溶剤抽出物による氷点降下を測定した。これらの諸実験の結果を総合すると, P-ニトロフェノールの氷点降下より算出されるフミソ酸の分子量 (約300) は, R.'S.Smithらの所説のように, フミン酸が溶媒中で開裂するために得られる過小値であり, 一方アセトアマイド中で得られる分子量 (約500～600) は ...
Kajiyama, Sigeru +3 more
openaire +4 more sources
Effect of Physical and Chemical Structure of Shengli Lignite on Its Spontaneous Combustion Tendency
Taiyuan Ligong Daxue xuebao, 2021 A series of oxidized coal samples were prepared by oxidation of Shengli lignite in air at 140 ℃ and 160 ℃ for different time. The functional groups and pore structure parameters of coal samples were analyzed and tested by Fourier transform infrared ...
Lin GAO +4 more
doaj +1 more source
Scientific Reports, 2023 The presence of different types of coal at room temperature can lead to self-heating of coal, potentially resulting in spontaneous combustion. To investigate the effect of ambient temperature pre-oxidation (BL) time on the self-combustion characteristics
Xun Zhang +5 more
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Biodesulphurisation of coal [PDF]
, 2001 The emission of sulphur oxides during the combustion of coal is one of the causes of an environmental problem known as acid rain. Biodesulphurisation technology applied as a method to remove sulphur before coal combustion was investigated in
Prayuenyong, P.
core +6 more sources
, 2021 Conventional hydrocarbon oil cannot adhere effectively to oxidized coal, resulting in a low yield of clean coal. In this study, a high-speed homogenizer was used to emulsify LDD (laurylamine dipropylene diamine) and kerosene, which enhanced the flotation
Qingshan Zhang +5 more
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Optimization of grinding pretreatment for effective flotation of oxidized coal
, 2017 Oxidized coal is difficult to float with common oily collectors because oxidation processes occurring on the coal surface reduces the surface hydrophobicity of coal.
C. Liang +7 more
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, 2013 Oxidized coal is difficult to float using oily collectors in the conventional flotation process. This study was aimed at designing the flotation process, namely the oily bubble flotation process, to float oxidized coal efficiently.
Yang, Jianguo, Xia, Wencheng
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